本研究利用電鍍污泥與廢棄寶特瓶兩種廢棄物作為原料，在鹽酸濃度1 M~5 M，液固比L/S = 5:1~9:1，萃取時間為20分鐘條件下，以酸萃取法回收電鍍污泥 中之金屬作為金屬來源，並利用反應曲面法及中央合成設計等方法優化實驗條件， 再以中性水解法，在持溫時間為6~10小時，液固比L/S = 10~20，溫度200°C條 件下，將廢棄寶特瓶分解為對苯二甲酸做為有機配體來源，同樣利用反應曲面法 優化最佳條件，並利用得到的原料以水熱法合成多金屬有機骨架材料，應用於電 解水產氫。 在液固比為10.5 mL/g，鹽酸濃度為 4.9 M的最佳酸萃取條件下，電鍍污泥 中，鉻(Cr)、鎳(Ni)與鐵(Fe)等金屬之回收率分別達 96%、100% 與 88%，且污泥 殘餘物經 TCLP 測試，所有金屬溶出量均降至低於偵測極限，符合一般事業廢棄 物之判定標準。廢棄寶特瓶在反應時間為 10.4小時，液固比L/S = 5的最佳中性 水解條件下，可獲得純度 94% 產率 93% 之再生對苯二甲酸(r-TPA)，且所得 r TPA 之化學結構、晶體構造與熱穩定性皆與商用試劑相似。 本研究所合成出之廢棄物衍生多金屬有機骨架材料(CrNiFe-BDC)，分析結果 顯示其具有紡錘形晶體與奈米片共存之異質結構，其比表面積為363.34 m2/g，平 均孔徑為1.36 nm，XRD 與 XPS 分析說明其為類 MIL-88B 結構。在1.0 M KOH 鹼性電解液中，此材料展現良好的OER活性，於10 mA cm-2 電流密度下，其過 電位僅需 299 mV，Tafel 斜率低至 46.9 mV dec-1，顯示其具有良好的反應動力學 與電荷轉移能力（Rct =0.9 Ω），而法拉第效率介於98.5% ~ 99.8%之間，經過1000 次CV 循環對其進行加速老化測試與72 小時計時安培法進行穩定性測試後，材 料依舊保持97.5%以上的活性。以上結果說明此利用廢棄物合成的材料，具有作 為低成本且具應用潛力之OER催化劑。;This study utilized two types of waste， electroplating sludge and waste polyethylene terephthalate (PET) bottles as precursors to synthesize multi-metal organic frameworks (MOFs) for application in electrochemical hydrogen production via water electrolysis. First， acid extraction was employed to recover metals from the electroplating sludge， operating under conditions of 1~5 M hydrochloric acid (HCl)， a liquid-to-solid (L/S) ratio of 5:1~9:1， and a 20 minute extraction time. Subsequently， neutral hydrolysis was applied to depolymerize the waste PET bottles into terephthalic acid (TPA) as the organic ligand source， reacting at 200°C for 6~10 hours with an L/S ratio of 10~20. Both pretreatment processes were systematically optimized using Response Surface Methodology (RSM) and Central Composite Design (CCD). The recovered metal ions and organic ligands were then utilized to synthesize the multi metal MOFs via a hydrothermal method. Under the optimal acid extraction conditions (L/S ratio of 10.5 mL/g and 4.9 M HCl)， the recovery rates of chromium (Cr)， nickel (Ni)， and iron (Fe) reached 96%， 100%， and 88%， respectively. Furthermore， the residual sludge passed the Toxicity Characteristic Leaching Procedure (TCLP) test， with all heavy metal leaching concentrations falling below the detection limits， successfully meeting the regulatory standards for general industrial waste. For the neutral hydrolysis， the optimal conditions (reaction time of 10.4 hours and L/S ratio of 5) yielded recovered terephthalic acid (r TPA) with a purity of 94% and a yield of 93%. The chemical structure， crystal morphology， and thermal stability of the resulting r-TPA were highly comparable to those of commercial reagents. Characterization of the synthesized waste-derived MOFs (CrNiFe-BDC) revealed a heterostructure comprising coexisting fusiform crystals and nanosheets. The material iii exhibited a high specific surface area of 363.34 m²/g and an average pore diameter of 1.36 nm. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses confirmed that it possesses a MIL-88B-like framework. In a 1.0 M KOH alkaline electrolyte， the material demonstrated excellent oxygen evolution reaction (OER) activity， requiring an overpotential of only 299 mV to attain a current density of 10 mA cm⁻². The low Tafel slope of 46.9 mV dec⁻¹ and a remarkably low charge transfer resistance (Rct) of 0.9 Ω indicated superior reaction kinetics and charge transfer capability. The Faradaic efficiency of the system ranged between 98.5% and 99.8%. Moreover， after an accelerated aging test of 1，000 cyclic voltammetry (CV) cycles and a 72 hour chronoamperometry stability test， the material maintained over 97.5% of its initial catalytic activity. These results comprehensively demonstrate that the multi-metal MOFs derived from waste materials hold significant potential as low-cost， highly stable， and efficient OER electrocatalysts.
